Mode Modify
TCH/H4.8 Half rate data 4.8kbit/s transparent
TCH/H2.4 Half rate data 2.4kbit/s transparent
TCH/H2.4 Half rate data 1.2kbit/s transparent
TCH/H2.4 Half rate data 1200/75bit/s transparent
TCH/H2.4 Half rate data 600bit/s transparent
Mode change between full rate channels and half rate channels is not
accepted.
RBS checks the availability of the requested resources and
acknowledges the MODE_MODIFY message by sending a
MODE_MODIFY_ACKNOWLEDGE message /GSM:08.58:8.4.10./ or
a MODE_MODIFY_NEGATIVE_ACKNOWLEDGE message /
GSM:08.58:8.4.11./ to the BSC.
The MODE_MODIFY_ACKNOWLEDGE message to BSC is not
related to the Air Interface. That is, the acknowledgement will be sent
before the actual transmission is started.
If the Mode Modify procedure fails after the
MODE_MODIFY_ACKNOWLEDGE message has been sent, a
CONNECTION_FAILURE_INDICATION /GSM:08.58:8.4.4/ message
is sent to BSC and the channel mode is changed to the mode requested
in the MODE_MODIFY message.
If the MODE_MODIFY_NEGATIVE_ACKNOWLEDGE message is
sent to the BSC, the channel mode is left unchanged (same as before
the MODE_MODIFY message was received).
After the positive acknowledgement of the MODE_MODIFY message,
the active service is deactivated and the requested service is activated.
14.3 Operational Conditions
The maximum delay from reception of a MODE_MODIFY command
until the command is acknowledged
(MODE_MODIFY_ACKNOWLEDGEMENT or
MODE_MODIFY_NEGATIVE_ACKNOWLEDGEMENT) is 25 ms.
114 (306)
EN/LZT 123 2697 R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
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